rear end question

8.5" 10 bolt chevy is its own

very common under billions of trucks and cars

70-up cars
some 77-82 C/K 5/10 trucks front and rear, and rear of G10 and G20 vans,
and all 83-up C/K 5/10 trucks front and rear and rear of G-10/G-20 vans

good luck

Watch out for non-standard-8.5 rear ends in those cars. They used some kind of orphan rear ends in some of them, and regular 8.5 parts won't work.